共查询到20条相似文献，搜索用时 314 毫秒
1.
EXPERIMENTAL STUDY OF WATER-ROCK HYDROGEN AND OXYGEN ISOTOPE EXCHANGE IN XIANGSHAN URANIUM ORE-FIELD
《Scientia Geologica Sinica》1997,(2)
ＥＸＰＥＲＩＭＥＮＴＡＬＳＴＵＤＹＯＦＷＡＴＥＲ－ＲＯＣＫＨＹＤＲＯＧＥＮＡＤＯＸＹＧＥＮＩＳＯＴＯＰＥＥＸＣＨＡＮＧＥＩＮＸＩＡＮＧＳＨＡＮＵＲＡＮＩＵＭＯＲＥ－ＦＩＥＬＤTXＥＸＰＥＲＩＭＥＮＴＡＬＳＴＵＤＹＯＦＷＡＴＥＲＲＯＣＫＨＹＤＲＯＧＥＮ... 相似文献
2.
美国环保局环境响应队（ＵＳＥＰＡ／ＥＲＴ）已广泛应用野外便携式Ｘ射线荧光仪９ＦＰＸＲＦ）在全国范围内对危险废物污染区的土壤和沉积物中的金属进行分析。ＵＳＥＰＡ／ＥＲＴ有两种Ｘ荧光仪：Ｏｕｔｏｋｕｍｐｕ电子公司（ＯＥＩ）的Ｘ－ＭＥＴ８８０型Ｓｐｅｃｔｒａｃｅ仪器公司生产的Ｓｐｅｃｔｒａｃｅ９０００型ＦＰＸＲＦ分析仪。文中讨论了仪器的标定、精度的确定和检出限，阐述了就地分析和分析制备的土壤术方法。各种 相似文献
3.
《Scientia Geologica Sinica》1998,(1)
ＰＲＯＶＥＮＡＮＣＥＡＮＡＬＹＳＥＳＯＦＬＡＴＥＰＡＬＥＯＺＯＩＣＣＬＡＳＴＩＣＳＩＮＴＨＥＫＡＭＵＳＴＥＡＲＥＡ,ＴＨＥＪＵＡＧＧＵＲＢＡＳＩＮ,ＸＩＮＪＩＡＮＧＺｈａｎｇＸｉａｏｈｕｉＩｎｓｔｉｔｕｔｅｏｆＧｅｏｌｏｇｙ,ＣｈｉｎｅｓｅＡｃａｄｅ... 相似文献
4.
《Scientia Geologica Sinica》1997,(2)
ＡＮＥＶＩＤＥＮＣＥＯＦＣＡＲＢＯＮＩＳＯＴＯＰＥＴＯＴＨＥＤＥＴＥＭＩＮＡＴＩＯＮＯＦＴＨＥＣＡＲＢＯＮＩＦＥＲＯＵＳ／ＰＥＲＭＩＡＮＢＯＵＮＤＡＲＹTXＡＮＥＶＩＤＥＮＣＥＯＦＣＡＲＢＯＮＩＳＯＴＯＰＥＴＯＴＨＥＤＥＴＥＲＭＩＮＡＴＩＯＮＯＦＴＨＥ... 相似文献
5.
《Scientia Geologica Sinica》1997,(3)
ＭＩＸＥＤＳＩＬＩＣＩＣＬＡＳＴＩＣＣＡＲＢＯＮＡＴＥＳＥＤＩＭＥＮＴＡＴＩＯＮＳＤＵＲＩＮＧＴＨＥＥＡＲＬＹＭＩＤＤＬＥＣＡＭＢＲＩＡＮＩＮＴＨＥＮＯＲＴＨＣＨＩＮＡＰＬＡＴＦＯＲＭ：ＡＥＸＡＭＰＬＥＦＲＯＭＺＨＡＮＧＸＩＡ，ＳＨＡＮＤＯＮＧ，... 相似文献
6.
《Scientia Geologica Sinica》1997,(2)
ＴＩＤＡＬＦＬＡＴＳＴＯＲＭＤＥＰＯＳＩＴＳＯＦＭＩＤＤＬＥＣＡＭＢＲＩＮＩＮＳＨＩＭＥＮＤＩＳＴＲＩＣＴ，ＨＵＮＡＮＰＲＯＶＩＮＣＥTXＴＩＤＡＬＦＬＡＴＳＴＯＲＭＤＥＰＯＳＩＴＳＯＦＭＩＤＤＬＥＣＡＭＢＲＩＡＮＩＮＳＨＩＭＥＮＤＩＳＴＲＩＣＴ，ＨＵ... 相似文献
7.
《全球沉积岩数据库》讲座（三）叶健骝，南君亚，杨卫东（中国科学院地球化学研究所贵阳）第三讲全球沉积岩数据库管理系统──ＦＯＸＳＥＤＢＡ及其使用方法ＦＯＸＳＥＤＢＡ是由ＩＧＣＰ２６９项目中国工作组根据ＳＥＤＢＡ数据结构模型在ＰＣ系列微计算机上开发研制的... 相似文献
8.
关于地勘工作发展战略及今年任务的思考①ＰＯＮＤＥＲＩＮＧＡＢＯＵＴＴＨＥＤＥＶＥＬＯＰＩＮＧＳＴＲＡＴＥＧＩＥＳＯＦＥＸＰＬＯＲＡＴＩＯＮＡＮＤＴＨＥＴＡＳＫＳＩＮＴＨＩＳＹＥＡＲ张攀华ＺｈａｎｇＰａｎｈｕａ湖南省地质矿产厅长沙４１００１１Ｈｕｎａｎ... 相似文献
9.
《Scientia Geologica Sinica》1997,(2)
ＡＳＴＲＡＴＡＢＯＵＮＤＬＥＡＤ－ＺＩＮＣＤＥＰＯＳＩＴＳＭＯＤＥＬＲＥＬＡＥＤＴＯＳＥＱＵＥＮＣＥＢＯＵＮＤＡＲＩＥＳＡＮＤＳＹＳＴＥＭＳＴＲＡＣＴＳＩＮＮＯＲＴＨＥＲＮＡＮＤＣＥＮＴＲＡＬＧＵＡＮＧＸＩ，ＣＨＩＮＡTXＡＳＴＲＡＴＡＢＯＵＮＤＬＥＡ... 相似文献
10.
１：５万区调中Ｒｎ－Ｈｇ联测及~（２１０）Ｐｏ等综合指标测量方法技术和应用研究ＴＥＣＨＮＩＱＵＥＳＡＮＤＡＰＰＬＩＣＡＴＩＯＮＯＦＣＯＭＢＩＮＥＤＲｎ－ＨｇＭＥＡＳＵＲＥＭＥＮＴＳＡＮＤＣＯＭＰＯＳＩＴＥＩＮＤＥＸＥＳ（~（２１０）ＰｏＡＮＤＯＴＨＥＲ... 相似文献
11.
北太平洋Rossby波研究进展 总被引：3，自引：0，他引：3
系统地阐述了北太平洋Rossby波在卫星观测、理论扩展及模型应用3个方面的研究成果.随着卫星观测技术的发展,明显地探测到海表面信号的Rossby波特征,且观测到波速在热带外大于自由Rossby波理论值.为解释这个波动加速现象,在自由Rossby渡理论的基础上,考虑了大气强迫、非静止基流及海底地形等因子的作用,使得Rossby波的波动理论得到了扩展.而关于风应力强迫Rossby波的线性理论模型主要有3类:一阶斜压Rossby波模型、局地Ekman抽吸模型和Svetdrup平衡模型.这些模型被广泛地应用到北太平洋海表面高度和温度/密度跃层深度等要素变化的机理研究中,得到了不同的模型在大洋的不同区域有不同的作用等结论.最后,对线性Rossby波研究存在的问题进行了初步探讨,提出了需要进一步解决的新课题. 相似文献
12.
基于卫星高度计的全球大洋潮汐模式的准确度评估 总被引：2，自引：0，他引：2
依据152个深海验潮站与大洋岛屿地面验潮站观测得到的8个主要分潮(M2、S2、K1、O1、N2、K2、P1及Q1)调和常数,对现有7个全球大洋潮汐模式的准确度进行了检验,结果显示各模式在深海大洋区域均达到了比较高的准确度:M2分潮的潮高均方根偏差在1.0～1.3cm之间;8个分潮的和方根偏差在2.1～2.3cm之间,与早期的模式相比,准确度又有了进一步提高。还依据中国近海18个岛屿的调和常数对其中的5个大洋潮汐模式的准确度进行了检验,结果表明,M2分潮均方根偏差在4.4～10cm,明显高于大洋的均方根偏差。其中日本国家天文台的潮汐模式NAO99在中国近海的结果相对较准确。 相似文献
13.
The Modular Ocean Model (MOM) is perhaps the most versatile ocean model available today for the simulation of the large scale
circulation of the ocean. The Topex/Poseidon altimeter which has been operating since September 1992 has been providing sea
surface heights (SSH) of the accuracy of 5–10 cms with a repeat cycle of 10 days. We examine in this paper, the SSH in the
Indian Ocean obtained from a global simulation of MOM with a resolution of 1° in the longitude, 1/3° in the latitude between
30°S and 30°N and 20 levels in the vertical with climatological windforcing and restoring conditions on temperature and salinity.
They are compared with the SSH from the Topex/Poseidon altimeter after suitable filtering in the time domain to remove smaller
time and length scales. In addition, unfiltered data from both sources are analysed by estimating the cross-spectral density
to find the coherence and crossphase at different frequencies. The agreement between the two, over most of the Northern Indian
Ocean, especially the Arabian Sea and the Bay of Bengal is quite good. 相似文献
14.
Raj Kumar Suchandra A. Bhowmick Sulagna Ray Vihang Bhatt Suhe Surendran Sujit Basu Abhijit Sarkar Vijay K. Agarwal 《Natural Hazards》2009,49(2):275-291
Accurate prediction of ocean surface waves is a challenging task with many associated difficulties. Availability of good quality
wind and wave information from satellite platforms inspired the scientific community to assimilate such data in various spectral
wave models for enhancing the accuracy of prediction. Over the Indian Ocean, which is the region of interest for the present
study, wave heights in extreme situation can go up to 12–14 m, thereby increasing the probability of coastal hazards. This
region is further governed by the southern ocean swells that propagate thousands of kilometers. These are, in general, not
well captured by the spectral wave models. Therefore, assimilation of altimeter data in open ocean wave model WAM has been
attempted with the aim of enhancing the quality of prediction of significant wave height. Further, simulated wave spectra
have been assimilated in a coastal wave model SWAN. This assimilation has been found to significantly improve the prediction
of the height of wind waves as well as swell waves.
V. Bhatt and S. Surendran are former students of Meteorology and Oceanography Group, Space Applications Centre, ISRO, Ahmedabad. 相似文献
15.
This paper looks at the relation between the time-averaged level of the sea surface and a gravimertic geoid, as determined in coastal areas. Measurements in local regions can now be accurate enough to demonstrate that the geoid and mean sea level are not even parallel to each other, let alone identical. The accuracy and pattern structure of surface gravity data in some shelf seas is comparable with those on land, so that a marine geoid can be derived from surface data without using satellite altimetry. The geodetic objective is then to combine the two to determine sea surface topography. In principle, gravimetric studies provide the absolute datum so that local oceanographic models on the shelf can be combined with sea surface topography models related to the global ocean circulation. In contrast, sea surface topography information near deep ocean coasts must come from external sources and satellite altimetry used to give the gravity data needed to offset the less good coverage by ship-borne gravimetry.Marine Bouguer anomalies enable two specific problems of gravity anomaly patterns near the continent ocean transition to be overcome. The necessary extension of Stokes' condensation reduction is developed and illustrated along a north-south profile from the Mediterranean across the Cote d'Azur. The effect on gravity of deep ocean water introduces a geoid correction in the form of a dipolar ridge whose amplitude at the shore is about 11 cm. In addition to geostrophic currents, a semi-quantitative model for the thermohaline effects on sea surface topography is discussed in relation to sea level differences between the Atlantic and Mediterranean.In considering appropriate algorithms for local geoid computation, Kirby's Iterative Fourier Combination routine for combining altimetry and surface gravity is extended to account for global sea surface topography. The impact of very fast spherical harmonic analysis algorithms is discussed and a simple physical model is given which explains the short coherence lengths found for the global gravity field. This necessary assumption for any local geoid computation was hitherto purely empirical.Finally, the use of land data such as tide gauges, ellipsoidal heights from GPS, and orthometric heights from first order levelling are reviewed as ways of corroborating geodetic estimates of sea surface topography and its relation to levelling datums. Successful examples are given from southern England. 相似文献
16.
17.
December 2004 tsunami in the Indian Ocean region has been simulated using MIKE-21 HD model. The vertical displacement of the seabed is incorporated into the numerical simulation by using time-varying bathymetry data. In the open ocean, sea surface height from altimeter observation has been used to validate the model results. To the west of the rupture zone, the crest is observed to precede the trough of the tsunami waves while to the east, trough preceded the crest. The model performance along the coastal region has been validated using de-tided sea levels from tide gauge measurements at Tuticorin, Chennai, Vishakapattanam, and Paradip ports along the east coast of India. Unique coastal characteristics of the tsunami waves, wave height, and wave celerity are reasonably simulated by the numerical model. Spectral analysis of tide gauge observations and corresponding model results has been done, and the distribution of frequency peaks from the analysis of gauge observations and the model results is observed to have a reasonable comparison. Low-frequency waves, contributed from the coastally trapped edge waves, are found to dominate both the tide gauge observations and the model results. The subsequent increase in the tsunami wave height observed at Chennai, Vishakapattanam, and Paradip has been explained on the basis of coastally trapped edge waves. From the validation studies using altimeter data and tide gauge data, it is observed that the model can be used effectively to simulate the tsunami wave height in the offshore as well as in the coastal region with satisfying performance. 相似文献
18.
Sensitivity of MM5 and WRF mesoscale model predictions of surface winds in a typhoon to planetary boundary layer parameterizations 总被引：2，自引：1，他引：1
Sea surface winds and coastal winds, which have a significant influence on the ocean environment, are very difficult to predict.
Although most planetary boundary layer (PBL) parameterizations have demonstrated the capability to represent many meteorological
phenomena, little attention has been paid to the precise prediction of winds at the lowest PBL level. In this study, the ability
to simulate sea winds of two widely used mesoscale models, fifth-generation mesoscale model (MM5) and weather research and
forecasting model (WRF), were compared. In addition, PBL sensitivity experiments were performed using Medium-Range Forecasts
(MRF), Eta, Blackadar, Yonsei University (YSU), and Mellor–Yamada–Janjic (MYJ) during Typhoon Ewiniar in 2006 to investigate
the optimal PBL parameterizations for predicting sea winds accurately. The horizontal distributions of winds were analyzed
to discover the spatial features. The time-series analysis of wind speed from five sensitivity experimental cases was compared
by correlation analysis with surface observations. For the verification of sea surface winds, QuikSCAT satellite 10-m daily
mean wind data were used in root-mean-square error (RMSE) and bias error (BE) analysis. The MRF PBL using MM5 produced relatively
smaller wind speeds, whereas YSU and MYJ using WRF produced relatively greater wind speeds. The hourly surface observations
revealed increasingly strong winds after 0300 UTC, July 10, with most of the experiments reproducing observations reliably.
YSU and MYJ using WRF showed the best agreements with observations. However, MRF using MM5 demonstrated underestimated winds.
The conclusions from the correlation analysis and the RMSE and BE analysis were compatible with the above-mentioned results.
However, some shortcomings were identified in the improvements of wind prediction. The data assimilation of topographical
data and asynoptic observations along coast lines and satellite data in sparsely observed ocean areas should make it possible
to improve the accuracy of sea surface wind predictions. 相似文献
19.
全球海潮模型研究进展 总被引：1，自引：1，他引：0
阐述潮汐分析方法和建模方法,归纳总结了FES,CSR,GOT,NAO,TPXO,EOT,DTU,HAMTIDE及OSU系列全球海潮模型的建立机构、使用数据及构建方法等。对比分析2010年后出现的几种新的海潮模型(FES2012,EOT11a,DTU10和HAMTIDE11a)在南大洋的M2振幅,发现模型间差异主要集中在浅水及极地地区,其中极地地区高精度卫星测高数据的缺少及海冰的季节性变化,是导致建模精度较差的主要原因。最后对海潮模型的发展方向提出一些建议。 相似文献
20.
The generation of a near-global set of orthometric height data derived from satellite altimetry has allowed for the first time an independent evaluation of the accuracy of existing Global Digital Elevation Models (GDEMs) on a near-global scale. This paper presents results from an intercomparison of GLOBE v1, GLOBE β and JGP95E with altimeter based datasets derived from the ERS-1 geodetic mission, together with ERS-1 and ERS-2 35 day data.One result of this research is the identification of common error signatures, where correlated height differences are seen to exist between the altimeter data and several of the DEMs. The ability to identify such erroneous ground truth data using altimetry facilitates the improvement of these global and regional models. Having targetted regions where the height data are inaccurate, it enables examination of these data for mis-registration and reference datum errors, which can then be corrected using altimetry derived heights. 相似文献